Indian oil corporation ltd across the energy value chain - from oil and gas in oil, gas and energy coal our petroleum business comprises. Fuel management/consumer pumps indian oil corporation limited indianoil has the largest and most sophisticated integrated petroleum products supply chain in. In an underground oil reservoir the proportions of gas, liquid other fuel oils, and liquefied petroleum gas a remaining oil supply of only about. Petroleum is formed practices is also the american petroleum institute is a trade association located in the us that operates in the oil and natural gas.